Vulnerability in u-boot

[ Description ]Official description

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3660

  DENX U-Boot: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-74221CVE-2026-74222CVE-2026-74220+5 more CVEs

[ References ]References

• github.com/u-boot/u-boot
• github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c
• github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a
• www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply